Hello! To me, a phrase begins with a capital, and ends with a full stop.It's a sentence. In a sentence, you may find different kinds of clauses: relative, temporal clauses, etc... But then I may be misled by French. Better wait till a native sees your post!
As I said before, the word "phrase" misled me. In French, a "phrase" is a sentence, begining with a capital and ending with a "."(or?, or!) Thanks for correcting me, Julie!